Thread-tension means for loom-shuttles.



PATENTED FEB. 28, 1905.

J. NORTHROP.

THREAD TENSION MEANS FOR LOOM SHUTTLES.

APPLICATION FILED OUT. 26, 1904.

$ L @m gy/wo Patented February" 28, 1905" rident,

J ()NAS NORTHROP, OF HOPEDALE, MASSACIrIUSE'lIlS, ASSIGNOR TO DRAPER COMPANY, OF HOPEDALE, MASSAUHUSEVFS, A CORPO- RATION OF M AINE.

THREAD-l ENSlUN MEANS FUN LOOiVt-QkltllVttlEFm SPECIFICATION forming part of Letters Patent No. 783,538, dated February 28, 1905.

Application filed October 26, 1904. Serial No. 230,013.

To (Ml 1071,0772]??? may concern/.-

Be it known that I, J oNAs Nonrunor, a citi- Zen of the United States, and a resident of Hopedale, county of WVorcester, State of Massachusetts, have invented an Improvement in illn'ead lension Means for Loom-Shuttles, oi which the following description, in connection with the accompanying drawings, is a specili' cation, like characters on the drawil'igs' representing like parts.

This invention has for its object the production of novel and efficient means for exerting a proper tension upon the filling-thread in a loom-shuttle as the thread is drawn off in the weaving operation, the tension means be ing so constructed and arranged that bits of lint, find, or small bunches or snarls will be thereby removed from the thread, while at the same time yielding to prevent breakage of the thread upon the abrupt passage of a bunch. The tension means also overcomes the weaving of double filling-that is, the weaving of several layers of yarn at once, which sometimes wind 01? from a bobbin. This is a common fault and is prevented by the present invention.

1 have herein shown my novel tension means applied to a loom-shuttle provided with automatically self-threading means, as it is particularly well adapted for such use by reason ol its automatic action; but my invention is not by any means restricted to that particular type of shuttle nor to the specil'ic form of selF-threzuling device herein chosen for illustration.

The novel features 01 my invention will be full i described in the sub'oined s medication and particularly pointed out in the following claims.

Figure 1 is a top or plan viewot the threaddelivery end of a loom-shuttle of the automatically self-threading type with my invention applied thereto. Fig. 2 is a front elevation of the threading device or block detached, showing the tension device in connection there with. Fig. 3 is a side elevation of the threading device, showing the transverse seat, the

tension-spring therein, and the thread-support, to be described. Fig. L is a partial longitudinal section through the threading device, taken on a line through the center of the thread-passage. Fig. 5 is a perspective view of the threzul-supprn't detached, and Fig. (3 is a pi-zrspective view of the tens-sion-spring.

The slu1ttlebody A, Fig. 1, open at topand bottom and adapted to receive the filling-car rier B, and the side-delivery eye a are all oi wellknown construction, the threading device or block herein illustrated being substantially as shown and described in United States Patent No. 769,9let, granted to me September 13, 1904:, and to which reference may be had.

The tln'eading-block, made o l metal, has a longitudinal thread-passage a in the base 1, with an elongated slit or inlet 5 in its top, the horn 12 having an enlarged and substantially triangular head 13, whose tip is prolonged to form a beak 14, which extends across the front open end of the thrinutpassage and is overlapped by a shield 15. all substautiz'illy as in said patent.

In accordance withthe present embodiment of my invention a transverse tubular hole or seat 30 is made in the base 1, extending from one to the other upright side of the block and intersecting the tlu'ead-passage back o! the horn 12 and under the inlet A coiled tension-spring 31, (see Fig. (3,) made, preferably, 01 line and closoly-coiled wire, is ii'lserted in the seat 31) so that a por tion of the upstanding coils thcreol cross the tlweatl-passage 1, (see Fig. 2 and dotted lines, Fig. 1,) the spring being held in place by the shuttle-wood when the thread lug-block is inserted in the slmttle-body, as shown in Fig. 1.

When the lilling-threzul zfis drawn through the inlet 5 into the tln'ead-passage, itis pulled down between adjacei'it spirals and drawn tl'ierethrough as it is directed by the horn 12 to the delivery-eye of the shuttle, the spirals thus automatically assuming and maintaining control oi. the thread and exerting tension thereupon as it is drawn through the threadpassage in the weaving operation. Not only is tension thus exerted upon the thread, but lint, dust, or small bunches or snarls are scraped or cleared therefrom as it is drawn between the spirals of the spring, the elasticity of the spring accommodating the same automatically to thread of different sizes and yielding sufliciently to prevent breakage upon the abrupt passage of a bunch and'weavingof double filling is prevented.

Vere the thread left to itself, the pull thereon would tend to drawit down upon the bottom of the thread-passage, so that it would pass through the lowest portion of the spring, reducing the tension to a minimum, and to prevent this 1 have provided a support which so sustains the thread that the spring will exert thereupon a maximum tension. To this end a staple-like support 32, made of wire and having substantially parallel legs 33, (see Fig. 5,) is applied to the tlneading-block so that one of the legs projects into the springseat 30 within the spring 31, as shown in Fig. j

3, and across the thread-passage. The lower leg enters a notch 3 L, cut in the bottom of the base 1 of the block, and the bend of the support enters a recess 35 in one side of the base. (See Fig. 3.)

hen the threading-block is inserted in the shuttle, the support 32 is firmly held in the position shown in Fig. 4 by the bottom and one side wall of the socket in which the block is seated, the upper leg 33 being held at about the longitudinal center of the tension-spring. The thread z is thus sustained in its travel between the adjacent spirals, so that it will be engaged thereby on opposite sides of the center of the spring, whereby the maximum tension effect of the spring will be exerted upon the thread.

In Fig. 1 I have not indicated the support, in order to avoid confusion in the drawing.

Various changes or modifications may be made by those skilled in the art without departing from the spirit and scope of my invention, one practical embodiment thereof being herein shown and described.

Having fully described my invention, what r I claim as new, and desire to secure by Letters Patent, is-

l. The combination in a loom-shuttle having means to automatically thread the same, said means having a transverse seat provided with fixed end walls and a concave bottom, of means to automatically apply and maintain a tension upon the thread as it is drawn through the threading means, said tension means comprising a coiled spring fixedly positioned in said seat extended across the path of and having its spirals upstanding and thereby disposed to receive the filling-thread between them.

2. The combination in a loom-shuttle having a delivery-eye, and a self-threading device provided with a longitudinal thread-pas sage and means to automatically direct the filling-thread into the thread-passage and thence to the delivery-eye, said threading device having a transverse, tubular spring-seat intersecting the thread-passage, of a closelycoiled tension-spring inserted in the seat and extended across the thread-passage, the upstanding spirals of the spring receiving between them the filling-thread and exerting tension thereupon as it is drawn through the passage.

3. The combination in a loom-shuttle having a self-threading device provided with a longitudinal thread-passage and an intersecting, transverse tubular spring seat, of a closely-coiled spring inserted in said seat and crossing the thread-passage, the upstanding, adjacent spirals of the spring receiving between them the filling-thread and exerting tension thereupon as it is drawn through the passage, and a fixed support passing through the spring to sustain the thread substantially between the top and bottom of the spirals.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JONAS NOR HROP. Witnesses:

GEORGE OTIS DRAIER, ERNns'r V. Woon. 

